Wetzsteon, Ross. <br/><br/>
Directores. 

 - Washington-XXU :   International Communicational Agency United States of America,   1981. 
 - p. 31-37 :   il. 
 - Trimestral 
 - No. 54(1981).  
 - Facetas ;   No. 54 .
 - International Communicational Agency United States of America. .
<br/><br/><br/>Espaņol.